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3D-printable ultra-high performance concrete as well as preparation method and use method thereof

An ultra-high-performance, 3D printing technology, applied in the field of concrete, can solve the problems of not being able to inherit the high strength and high toughness of UHPC

Active Publication Date: 2020-08-07
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the effect of this invention is not ideal in the actual 3D printing concrete materials, especially in the preparation of low water-binder ratio cement-based materials (UHPC), and cannot well inherit the characteristics of high strength and high toughness of UHPC.

Method used

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  • 3D-printable ultra-high performance concrete as well as preparation method and use method thereof
  • 3D-printable ultra-high performance concrete as well as preparation method and use method thereof
  • 3D-printable ultra-high performance concrete as well as preparation method and use method thereof

Examples

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preparation example Construction

[0056] The present invention also provides a method for preparing the 3D printable ultra-high performance concrete described in the above technical solution, comprising the following steps:

[0057] (1) Portland cement, silica fume, fly ash, quartz powder, fine aggregate, coarse aggregate and stabilizer are mixed to obtain a mixed material;

[0058] Mix the water reducer with water to obtain a mixed slurry;

[0059] mixing cellulose with water to obtain a cellulose solution;

[0060] (2) mixing the mixed material, mixed slurry and cellulose solution obtained in the step (1) to obtain a mixture;

[0061] (3) mixing steel fibers with the mixture obtained in step (2) to obtain 3D printable ultra-high performance concrete.

[0062] The invention mixes Portland cement, silica fume, fly ash, quartz powder, fine aggregate, coarse aggregate and stabilizer to obtain a mixed material. The present invention has no special limitation on the operation of mixing the Portland cement, sili...

Embodiment 1

[0078] In terms of parts by weight, 612 parts of Portland cement with a strength grade of 52.5, 200 parts of silica fume with a particle size of 6 μm to 8 μm, 112 parts of fly ash with a particle size of 350 μm to 380 μm, and a particle size of 0.09 mm to 336 parts of 0.10mm quartz powder, the particle size is 0.22-0.23mm, and the bulk density is 1620kg / m 3 360 parts of quartz sand, the particle size is 1.0-1.11mm, and the bulk density is 1521kg / m 3 504 parts of quartz sand, 68 parts of quick-hardening sulfoaluminate cement and 5 parts of attapulgite are mixed to obtain a mixed material; 10 parts are mixed with 108 parts of water (the mass ratio of water reducer and water is 10:108) to obtain mixed slurry; Parts of water were mixed (the mass ratio of hydroxypropylmethylcellulose to water was 10:108) to obtain a cellulose solution.

[0079] (2) Pre-stir the obtained mixed material in the stirring pot for 120s; then add the obtained mixed slurry into the pre-stirred mixed mat...

Embodiment 2

[0082] The difference between Example 2 and Example 1 is that "68 parts of rapid-hardening sulfoaluminate cement and 5 parts of attapulgite" are replaced by "5 parts of attapulgite", and the other steps are the same as in Example 1, that is, the obtained 3D printable ultra-high performance concrete. The 3D printable ultra-high performance concrete is printed using the 3D printing parameters in Example 1, and the obtained products are as follows: image 3 , the mechanical properties are characterized as figure 2 Example 2.

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Abstract

The invention provides 3D-printable ultra-high performance concrete, and belongs to the technical field of concrete. The 3D-printable ultra-high performance concrete provided by the invention comprises the following components in parts by weight: 600 to 620 parts of Portland cement of which the strength grade is not lower than 42.5, 190 to 210 parts of silica fume, 100 to 120 parts of fly ash, 330to 340 parts of quartz powder, 350 to 370 parts of a fine aggregate, 500 to 510 parts of a coarse aggregate, 144 to 200 parts of steel fibers, 8 to 22 parts of a water reducing agent, 1 to 3 parts ofcellulose, and a stabilizer, wherein the stabilizer comprises 60 to 80 parts of sulfoaluminate cement and / or 5 to 8 parts of clay minerals. The ultra-high performance concrete provided by the invention can be used for 3D printing, and the defect that UHPC is difficult for 3D printing molding is overcome; and the prepared 3D-printable UHPC can achieve mechanical properties equivalent to those of conventional UHPC, and has the characteristics of high strength and high toughness.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a 3D-printable ultra-high performance concrete and a preparation method and application method thereof. Background technique [0002] The concrete 3D printing construction process subverts the traditional building construction process, and has the advantages of intelligence, flexibility, speed and no mold. However, 3D printing molding components based on the modification of traditional building materials inherit the disadvantages of low tensile strength, easy cracking and high brittleness of traditional building materials, which has become one of the biggest bottlenecks restricting the further scale development of concrete 3D printing. [0003] As a new type of building material, ultra-high performance concrete (UHPC) has greatly improved the shortcomings of traditional building materials in terms of tensile strength and toughness. However, the existing UHPC materia...

Claims

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Application Information

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IPC IPC(8): C04B28/06B33Y70/10
CPCB33Y70/10C04B28/06C04B2111/00181C04B18/146C04B18/08C04B14/06C04B14/102C04B7/02C04B24/383C04B2103/302C04B14/48
Inventor 王里马国伟
Owner HEBEI UNIV OF TECH
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